The Side Plank Reach Under is one of my favourite exercises to build strength and tighten your oblique muscles. The Side Plank Reach Under was a key exercise I used to develop core strength, along with better truck rotation and flexibility.

The Side Plank Reach Under is one of my favourite exercises to build strength and tighten your oblique muscles. The Side Plank Reach Under was a key exercise I used to develop core strength, along with better truck rotation and flexibility.